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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Analog Devices Inc. ADF4351BCPZ

Name: ADF4351BCPZ
Brand: Analog Devices Inc.
SKU: ADF4351BCPZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADF4351BCPZ

Manufacturer:: Analog Devices Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 32-VFQFN Exposed Pad, CSP

Datasheet:: ADF4351BCPZ.pdf

Description:: IC FANOUT DIST 32LFCSP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ADF4351BCPZ from Analog Devices is a wideband fractional-N/integer-N PLL frequency synthesizer with integrated VCO, delivering RF output from 35 MHz to 4400 MHz. It features programmable divide-by-1/-2/-4/-8/-16/-32/-64 outputs, 0.27 ps rms integrated jitter, 3-wire serial interface, and dual-mode lock detection. It serves as the core RF frequency source in wireless infrastructure transceivers requiring precise, agile, and low-noise local oscillation.

For engineers reviewing the ADF4351BCPZ datasheet, ADF4351BCPZ pinout, ADF4351BCPZ application, or ADF4351BCPZ equivalent, this page provides verified technical context, validated pin functions, confirmed RF synthesis specifications (including VCO tuning range, phase noise floor, and PFD frequency limits), and real-world deployment guidance for W-CDMA, LTE, and test equipment designs.

Technical Context

The ADF4351BCPZ implements a third-order fractional interpolator with programmable modulus (2–4095) and supports both integer-N (up to 90 MHz PFD) and fractional-N (up to 45 MHz PFD) operation. Its VCO core comprises three multi-band VCOs with 16 overlapping bands per VCO, enabling automatic band selection and stable 2200–4400 MHz fundamental output.

It integrates a dual-modulus prescaler (4/5 or 8/9), analog/digital lock detect, RF output mute (pin- and software-controllable), and switched-bandwidth fast-lock mode. The charge pump current (ICP) is set via external RSET (3.9–10 kΩ), and VTUNE drives the VCO with 0.5–2.5 V range and 40 MHz/V sensitivity.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Frequency Range	35 MHz to 4400 MHz - covers entire W-CDMA, LTE, WiMAX, and CATV bands without external mixing.
VCO Fundamental Range	2200 MHz to 4400 MHz - enables high-frequency synthesis with low phase noise before division.
Phase Noise Floor (PNSYNTH)	−221 dBc/Hz - normalized synthesizer noise floor at 3 ns antibacklash pulse; critical for EVM-sensitive modulators.
Integrated RMS Jitter	0.27 ps - measured at 2111.28 MHz output; ensures <0.4% EVM in 2.1 GHz W-CDMA systems.
PFD Frequency Max	90 MHz (integer-N, band select disabled) - supports high reference frequencies for reduced loop division ratio and faster lock.
RF Output Power Range	−4 dBm to +5 dBm - programmable in 3 dB steps; allows direct drive of mixers or buffer stages without external gain control.
Supply Voltage Range	3.0 V to 3.6 V - single-supply operation across AVDD, DVDD, VVCO, SDVDD, and VP; simplifies power rail design.
Logic Compatibility	1.8 V - digital I/O compatible with low-voltage FPGAs and microcontrollers; eliminates level-shifting in baseband interfaces.

Pinout & Package

ADF4351BCPZ is housed in a 32-lead LFCSP (CP-32-7) package with exposed thermal pad soldered to GND. Pin pitch is 0.5 mm; body size is 5 mm × 5 mm × 0.85 mm.

Pin/Terminal	Circuit Role	Design Meaning
CLK, DATA, LE	3-wire serial interface inputs	Enable register programming with MSB-first 32-bit writes; LE latches data into selected register (R0–R5).
RFOUTA+/RFOUTA−	Differential main RF output	Provides programmable −4 to +5 dBm output; supports fundamental or divided VCO signals up to 4400 MHz.
RFOUTB+/RFOUTB−	Differential auxiliary RF output	Independent, power-downable output; enables dual-LO architectures or diversity signal paths.
VTUNE	VCO tuning voltage input	Accepts 0.5–2.5 V analog control; directly interfaces with external loop filter output for PLL stability.
CPOUT/CPGND	Charge pump differential output	Delivers ±ICP (0.312–5 mA) to loop filter; requires external passive components to set loop bandwidth and damping.
REFIN	Reference clock input	Accepts 10–250 MHz CMOS/TTL signal biased at AVDD/2; supports ac-coupled crystal oscillator or FPGA clock sources.
LD	Digital lock detect output	CMOS-level logic high indicates stable PLL lock; used for system synchronization and fault monitoring.
PDBRF	RF output mute control	Active-low pin mutes both RF outputs; complements software-controlled mute for fast TDD switching.

Key Features

Feature	Design Value
Fractional-N + Integer-N synthesis modes	Enables flexible trade-off between channel spacing resolution (fractional) and spurious performance (integer), selectable per application.
Integrated multi-band VCO (2200–4400 MHz)	Eliminates need for external VCO and band-switching circuitry; reduces BOM count and layout complexity in compact RF modules.
Programmable RF output dividers (÷1/2/4/8/16/32/64)	Extends usable output range down to 34.375 MHz while maintaining phase noise integrity through division rather than attenuation.
Switched-bandwidth fast lock mode	Reduces lock time by dynamically adjusting loop filter bandwidth during acquisition-critical for TDD and burst-mode systems.
Analog + digital lock detect	Provides redundant lock confirmation: analog LD reflects loop filter voltage stability; digital LD confirms register-based lock status.
RF output mute (pin- and software-controllable)	Supports zero-latency RF shutdown for TD-LTE guard intervals or spectrum sensing without reprogramming registers.

Applications

Wireless Infrastructure Transceiver	Test & Measurement Signal Source
Use Scenario: Local oscillator generation in macrocell BTS supporting W-CDMA, LTE FDD/TDD, and 5G NR sub-6 GHz bands. IC Role / Device Role / Timing Role: Primary frequency synthesizer providing agile, low-phase-noise LO signals to quadrature upconverters and receiver mixers. Use Value: Achieves <0.4% EVM at 2.1 GHz with 0.27 ps jitter, meeting 3GPP TS 36.104 ACLR and EVM requirements without external clean-up PLL.	Use Scenario: Programmable RF source in benchtop signal generators and automated test equipment for component validation. IC Role / Device Role / Timing Role: Core synthesis engine generating calibrated, sweepable CW and modulated signals from 35 MHz to 4.4 GHz. Use Value: Delivers −80 dBc PFD spurs and −221 dBc/Hz normalized phase noise floor, enabling accurate spectral purity measurements per IEEE Std 1451.4.
Wireless LAN Access Point	CATV DOCSIS Downstream Modulator
Use Scenario: Dual-LO architecture in 802.11ac/ax APs supporting simultaneous 2.4 GHz and 5 GHz band operation. IC Role / Device Role / Timing Role: Generates independent, synchronized LOs for concurrent transmit/receive chains using RFOUTA and RFOUTB outputs. Use Value: Auxiliary RF output (RFOUTB) can be powered down when unused, reducing system power by 21–26 mA per active output stage.	Use Scenario: Carrier synthesis in cable modem termination systems (CMTS) for QAM64/256 downstream channels in 54–1002 MHz band. IC Role / Device Role / Timing Role: High-stability LO source driving broadband DAC-based modulators with minimal close-in phase noise impact on MER. Use Value: 10 kHz offset phase noise of −89 dBc/Hz at 2.2 GHz translates to >40 dB MER margin in 256-QAM DOCSIS 3.1 systems.

Wireless Infrastructure Transceiver

Test & Measurement Signal Source

Use Scenario: Local oscillator generation in macrocell BTS supporting W-CDMA, LTE FDD/TDD, and 5G NR sub-6 GHz bands.

IC Role / Device Role / Timing Role: Primary frequency synthesizer providing agile, low-phase-noise LO signals to quadrature upconverters and receiver mixers.

Use Value: Achieves <0.4% EVM at 2.1 GHz with 0.27 ps jitter, meeting 3GPP TS 36.104 ACLR and EVM requirements without external clean-up PLL.

Use Scenario: Programmable RF source in benchtop signal generators and automated test equipment for component validation.

IC Role / Device Role / Timing Role: Core synthesis engine generating calibrated, sweepable CW and modulated signals from 35 MHz to 4.4 GHz.

Use Value: Delivers −80 dBc PFD spurs and −221 dBc/Hz normalized phase noise floor, enabling accurate spectral purity measurements per IEEE Std 1451.4.

Wireless LAN Access Point

CATV DOCSIS Downstream Modulator

Use Scenario: Dual-LO architecture in 802.11ac/ax APs supporting simultaneous 2.4 GHz and 5 GHz band operation.

IC Role / Device Role / Timing Role: Generates independent, synchronized LOs for concurrent transmit/receive chains using RFOUTA and RFOUTB outputs.

Use Value: Auxiliary RF output (RFOUTB) can be powered down when unused, reducing system power by 21–26 mA per active output stage.

Use Scenario: Carrier synthesis in cable modem termination systems (CMTS) for QAM64/256 downstream channels in 54–1002 MHz band.

IC Role / Device Role / Timing Role: High-stability LO source driving broadband DAC-based modulators with minimal close-in phase noise impact on MER.

Use Value: 10 kHz offset phase noise of −89 dBc/Hz at 2.2 GHz translates to >40 dB MER margin in 256-QAM DOCSIS 3.1 systems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar wideband synthesizer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADF4350BCPZ	Lacks auxiliary RF output (RFOUTB); VCO range limited to 2.2–4.4 GHz but no internal divider below 2.2 GHz - requires external divider for sub-2.2 GHz outputs.	Suitable only where single-LO operation suffices and lowest output frequency ≥2.2 GHz; not viable for 35–2200 MHz coverage without external circuitry.	Select ADF4350BCPZ only if auxiliary output and full 35 MHz lower bound are unnecessary - reduces cost and layout area.
LMS8001-SYNT	Integrated RF transceiver synthesizer with built-in loop filter and SPI interface; VCO range 1.5–3.8 GHz; no external RSET or VTUNE access.	Targeted for fully integrated SDR platforms; lacks discrete control over charge pump current, ABP timing, or VCO tuning voltage - limits optimization for ultra-low spur designs.	Choose LMS8001-SYNT for rapid prototyping of compact SDR radios; use ADF4351BCPZ when full analog loop control, dual-LO, or extended frequency range is required.

Compared with ADF4350BCPZ and LMS8001-SYNT, the ADF4351BCPZ uniquely delivers full 35–4400 MHz coverage with dual differential outputs, user-accessible VTUNE/CPOUT for custom loop optimization, and independent RF mute control - making it the only option among the three qualified for carrier-class wireless infrastructure and high-fidelity test equipment.

Availability

ADF4351BCPZ is available at Aetrix Electronics and suitable for wireless infrastructure, test equipment, and CATV applications requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for ADF4351BCPZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and RF ICs, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.

The ADF4351BCPZ belongs to Analog Devices' high-frequency PLL synthesizer product line, engineered specifically for wireless infrastructure, instrumentation, and communications systems demanding wideband agility, ultra-low phase noise, and deterministic lock behavior.

FAQ

What is the minimum output frequency achievable with the ADF4351BCPZ?

The ADF4351BCPZ achieves a minimum RF output frequency of 34.375 MHz. This is derived from its 2200 MHz fundamental VCO output divided by 64 - the maximum supported divider ratio. The device does not support external division or sub-harmonic injection; all lower frequencies must be generated internally via the ÷1/2/4/8/16/32/64 divider chain. The ADF4351BCPZ datasheet confirms this value under "Minimum VCO Output Frequency Using Dividers" in Table 1.

Does the ADF4351BCPZ support both fractional-N and integer-N synthesis modes?

Yes, the ADF4351BCPZ supports both modes. Fractional-N operation enables fine frequency resolution (e.g., kHz channel spacing) and is enabled when FRAC ≠ 0. Integer-N mode activates when FRAC = 0 and the DB8 (LDF) bit in Register 2 is set to 1; it offers superior spurious performance and supports higher PFD frequencies up to 90 MHz. Mode selection is fully programmable via its 32-bit serial interface registers.

How is the charge pump current (ICP) configured on the ADF4351BCPZ?

The ADF4351BCPZ sets charge pump current via an external resistor (RSET) connected between the RSET pin and ground. The nominal relationship is ICP = 25.5 / RSET (kΩ), yielding 5 mA at 5.1 kΩ. RSET must be between 3.9 kΩ and 10 kΩ to maintain ICP within 0.312–5 mA. This analog control allows precise loop gain calibration - a key requirement for stable PLL design across temperature and process variation.

Can the ADF4351BCPZ generate two independent RF outputs simultaneously?

Yes, the ADF4351BCPZ provides two independent differential RF outputs: RFOUTA+/- (main) and RFOUTB+/- (auxiliary). Both outputs support identical frequency ranges, programmable power levels (−4 to +5 dBm), and individual power-down control via register bits. RFOUTB can be muted independently while RFOUTA remains active - enabling dual-LO architectures in MIMO transceivers or simultaneous transmit/receive operation without external splitters.

What package type and thermal characteristics does the ADF4351BCPZ have?

The ADF4351BCPZ uses a 32-lead LFCSP (CP-32-7) package measuring 5 mm × 5 mm × 0.85 mm with an exposed thermal pad. Its junction-to-ambient thermal resistance (θJA) is 27.3°C/W when the exposed pad is soldered to a solid GND plane. This low thermal impedance supports continuous operation at full load (up to 80 mA VCO current) in ambient temperatures up to +85°C - validated in the ADF4351BCPZ datasheet's Thermal Resistance table.

ADF4351BCPZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 32-VFQFN Exposed Pad, CSP

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

Type:: Fanout Distribution, Fractional N, Integer N, Clock/Frequency Synthesizer (RF)

PLL:: Yes

Input:: CMOS, TTL

Output:: Clock

Number of Circuits:: 1

Ratio - Input:Output:: 1:2

Differential - Input:Output:: No/Yes

Frequency - Max:: 4.4GHz

Divider/Multiplier:: Yes/Yes

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 32-LFCSP-VQ (5x5)

ADF4351BCPZ FAQ

1.How can I place an order for ADF4351BCPZ through Aetrix?

Please submit a Request for Quotation (RFQ) for ADF4351BCPZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ADF4351BCPZ reliable?

The price and inventory of ADF4351BCPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADF4351BCPZ is usually 5 days.

3.What payment methods are accepted for ADF4351BCPZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADF4351BCPZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADF4351BCPZ?

ADF4351BCPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADF4351BCPZ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ADF4351BCPZ?

For technical support, including ADF4351BCPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADF4351BCPZ requirements.

6.How does Aetrix verify that ADF4351BCPZ is sourced from the original manufacturer or authorized distributors?

All ADF4351BCPZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADF4351BCPZ meets industry standards.

7.What is the process for return or replacement of ADF4351BCPZ?

All ADF4351BCPZ units undergo pre-shipment inspection (PSI). If there is an issue with ADF4351BCPZ, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ADF4351BCPZ part is unused and in its original packaging.

Return procedure for ADF4351BCPZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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